First time that I know of... or at least I think it was made...
... occurred a couple weeks ago in Chattanooga.
We'd stopped, en route to Nashville, to get some gas. Don't get me started about how crazy the signage is off the interstate in the downtown area... on-ramps and off-ramps aren't necessarily in the same spot, etc.
So, anyway, we pull off on what, from the name of the street, seemed like a likely candidate to have gas stations (for some reason, they don't have gas station signs before the exits near Chattanooga; they do elsewhere in TN...). After driving several blocks, and hitting some odd intersections, we found a gas station.
While I was pumping gas, some "interesting" characters were going in and out of the station's convenience store. I don't say that because they were a different race than me; I say that because some of them seemed to have stepped out of SuperFly or some of the other bad 70's flicks. It was kind of entertaining, but I was happy it was broad daylight.
A more normal-looking gentleman, a bit older than me, walked by the front of my truck on the way from his car to the store. I smiled and nodded at him. He smiled back, and said, "good thing you've got a Roscoe," as he continued walking to the store.
Not sure if he made it (M&P45c under my shirt), or if he assumed I had one, or if he was only joking.